<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{path:'/home'}">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="addForm.goods_cat" @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- <el-upload
              class="upload-demo"
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headersObj">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload> -->
            <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button  type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="30%">
      <img :src="previewPath" class="previewImg">
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data () {
    return {
      activeIndex:'0',
      addForm:{
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        goods_cat:[],
        pics:[],
        // 商品的详情描述
        goods_introduce:'',
        attrs:[]
      },
      addFormRules:{
        goods_name:[
          {required:true,message:'请输入商品名称',trigger:'blur'}
        ],
        goods_price:[
          {required:true,message:'请输入商品价格',trigger:'blur'}
        ],
        goods_weight:[
          {required:true,message:'请输入商品重量',trigger:'blur'}
        ],
        goods_number:[
          {required:true,message:'请输入商品数量',trigger:'blur'}
        ],
        goods_cat:[
          {required:true,message:'请选择商品分类',trigger:'blur'}
        ]
      },
      catelist:[],
      cateProps:{
        label:'cat_name',
        value:'cat_id',
        children:'children'
      },
      manyTableData:[],
      onlyTableData:[],
      // 上传图片的URL地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      headerObj:{
        Authorization:window.sessionStorage.getItem('token')
      },
      previewPath:'',
      previewVisible:false
    };
  },
  created(){
    this.getCateList()
  },
  methods:{
    async getCateList(){
      const {data:res} = await this.$http.get('categories')
      if(res.meta.status != 200)return this.$message.error('获取商品分类数据失败')
      this.catelist = res.data
    },
    //级联选择器变化了会触发这个函数
    handleChange(){
      console.log(this.addForm.goods_cat)
      if(this.addForm.goods_cat.length != 3){
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName,oldActiveName){
      // console.log('即将离开的标签页名字是:'+oldActiveName)
      // console.log('即将进入的标签页名字是:'+activeName)
      if(oldActiveName === '0' && this.addForm.goods_cat.length != 3){
        this.$message.error('请先选择商品分类!')
        return false 
      }
    },
    async tabClicked(){
      //证明访问的是动态参数面板
      if(this.activeIndex === '1'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
        if(res.meta.status != 200){
          return this.$message.error('获取动态参数列表失败')
        }
        console.log(res.data)
        res.data.forEach(item=>{
          item.attr_vals = item.attr_vals.length === 0?[] : item.attr_vals.split(',')
        })
        this.manyTableData = res.data 
      }else if(this.activeIndex === '2'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
        if(res.meta.status != 200)return this.$message.error('获取静态属性失败')
        this.onlyTableData = res.data 
      }
    },
    //处理图片预览效果
    handlePreview(file){
      this.previewPath = file.response.data.url
      this.previewVisible = true 
    },
    //删除图片
    handleRemove(file){
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.tmp_path 
      // 2. 从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x=>x.pic === filePath)
      // 3. 调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i,1)
      console.log(this.addForm)
    },
    //监听图片上传成功的事件
    handleSuccess(response){
      // 1. 拼接得到一个图片信息对象
      const picInfo = {pic:response.data.tmp_path}
      // 2. 将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    add(){
      this.$refs.addFormRef.validate(async valid=>{
        if(!valid){
          return this.$message.error('请填写必要的表单项')
        }
        //执行添加的业务逻辑
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        //处理动态参数
        this.manyTableData.forEach(item=>{
          const newInfo = {
            attr_id:item.attr_id,
            attr_value:item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        //处理静态属性
        this.onlyTableData.forEach(item=>{
          const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals}
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs 
        // console.log(form)

        //发起请求添加商品
        // 商品的名称，必须是唯一的
        const {data:res} = await this.$http.post('goods',form)
        if(res.meta.status != 201){
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed:{
    cateId(){
      if(this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }
      return null 
    }
  }
}
</script>
<style lang='less' scoped>
  .el-checkbox{
    margin:0 5px 0 0 !important;
  }
  .previewImg{
    width:100%;
  }
  .btnAdd{
    margin-top: 15px;
  }
</style>